尝试Java中的catch语句练习

Question

Java新手在这里，我正在做一个练习，试图通过使用尽可能少的尝试来捕获抛出的异常…尽可能使用Catch语句。当我编译代码时，我收到了IllegalArgumentException错误，不确定如何通过使用try…捕捉语句。

我看过教程，看了其他的例子，但因为这对我来说是一个新的概念，我仍然不确定如何使用的尝试…

public class Main extends Object {
public static void main(String [] args) {
    tryGetMax();
    tryRemove();
private static final void tryGetMax() {
    int max = 0;
    max = FunMethods.getMax((Integer[])null);
    Integer[] numbers = new Integer[50];
    Random rand = new Random();
    for (int i = 0; i < 50; i++) {
        numbers[i] = new Integer(rand.nextInt(500));
    }
    numbers[32] = null;
    max = FunMethods.getMax(numbers);
    numbers[32] = new Integer(rand.nextInt(500));
    max = FunMethods.getMax(numbers);
}

练习第二部分:

private static final void tryRemove() {
    FunMethods.remove(null, 2);
    Object[] someObjects = new Object[12];
    someObjects[0] = "a string!";
    someObjects[1] = new Integer(32);
    someObjects[2] = new Float(42.5f);
    someObjects[3] = "another string";
    for (int i = 4; i < someObjects.length; i++) {
        someObjects[i] = String.valueOf(i);
    }
    FunMethods.remove(someObjects, 12);
    someObjects = FunMethods.remove(someObjects, 3);

Answer 1

try{
  //Code that can potentially throw an exception
} catch (IllegalArgumentException e){
  //Code to run if exception is throw
}

异常被赋值给变量e，该变量具有某些可以调用的方法

Answer 2

好的，在public static void main(String[] args) {下面应该有try {。然后，在主方法的末尾，您应该有} catch (IllegalArgumentException e) {。在那下面，你应该有捕获异常的代码，和} .

现在

:

public static void main(String [] args) {
    tryGetMax();
    tryRemove();

看起来像这样:

public static void main(String [] args) {
    try {
        tryGetMax();
        tryRemove();
    } catch(IllegalArgumentException e) {
        //this code runs if e is thrown
    }